Secret Chat allows you to send messages, which will disappear after a time chosen by you. For example, you can choose to have your messages disappear after three or ten seconds.
Step 1. Select the conversation you want to use Secret Chat on.
Step 2. Select the three dots at the top right-hand side of your screen.
Step 3. Select "Secret Message".
Step 4. Select the duration. Your messages will disappear after the time you choose.
Step 5. You now have Secret Message activated on your chat. The yellow timer beside your message counts down the time until your message disappears.